// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Collections;
using System.ComponentModel;
using System.Xml.Serialization;
 
namespace System.Xml.Schema
{
    public class XmlSchemaIdentityConstraint : XmlSchemaAnnotated
    {
        private string? _name;
        private XmlSchemaXPath? _selector;
        private readonly XmlSchemaObjectCollection _fields = new XmlSchemaObjectCollection();
        private XmlQualifiedName _qualifiedName = XmlQualifiedName.Empty;
        private CompiledIdentityConstraint? _compiledConstraint;
 
        [XmlAttribute("name")]
        public string? Name
        {
            get { return _name; }
            set { _name = value; }
        }
 
        [XmlElement("selector", typeof(XmlSchemaXPath))]
        public XmlSchemaXPath? Selector
        {
            get { return _selector; }
            set { _selector = value; }
        }
 
        [XmlElement("field", typeof(XmlSchemaXPath))]
        public XmlSchemaObjectCollection Fields
        {
            get { return _fields; }
        }
 
        [XmlIgnore]
        public XmlQualifiedName QualifiedName
        {
            get { return _qualifiedName; }
        }
 
        internal void SetQualifiedName(XmlQualifiedName value)
        {
            _qualifiedName = value;
        }
 
        [XmlIgnore]
        internal CompiledIdentityConstraint? CompiledConstraint
        {
            get { return _compiledConstraint; }
            set { _compiledConstraint = value; }
        }
 
        [XmlIgnore]
        internal override string? NameAttribute
        {
            get { return Name; }
            set { Name = value; }
        }
    }
 
    public class XmlSchemaXPath : XmlSchemaAnnotated
    {
        private string? _xpath;
 
        [XmlAttribute("xpath"), DefaultValue("")]
        public string? XPath
        {
            get { return _xpath; }
            set { _xpath = value; }
        }
    }
 
    public class XmlSchemaUnique : XmlSchemaIdentityConstraint
    {
    }
 
    public class XmlSchemaKey : XmlSchemaIdentityConstraint
    {
    }
 
    public class XmlSchemaKeyref : XmlSchemaIdentityConstraint
    {
        private XmlQualifiedName _refer = XmlQualifiedName.Empty;
 
        [XmlAttribute("refer")]
        public XmlQualifiedName Refer
        {
            get { return _refer; }
            set { _refer = value ?? XmlQualifiedName.Empty; }
        }
    }
}